Black Locust (Robinia Pseudoacacia) Overview

The black locust (Robinia pseudoacacia) is a deciduous tree that grows up to a height of 60 to 80 feet and has broad, deeply grooved, deep brown and splitting branches. The tree is native to North America having originated in the Appalachian Mountains and is said to be nectarous. The tree bears leaves that are often able to reach lengths of 8 to10 inches and comprise elliptical leaflets that are around 1 to 2.5 inches long. At the base of each leaf there is a pair of thorns that are approximately half an inch in length. The black locust is such variety that it grows on its own accord on nearly every type of soil, but prefers even meadows with sandy soils. As the black locust trees have a very hard core and are extremely moisture resistant, the wood of the tree is used in different kinds of building purposes, including ships and manufacturing plaques. In addition, the black locust leaves and flowers also possess therapeutic properties and are used to treat several disorders.

Black Locust (Robinia Pseudoacacia) picture

The tree produces white and pleasantly aromatic flowers that appear in bunch during May and June. The flowers have a resemblance to the pea blossoms and produces fruits that are brown-reddish flattened seedpods that enables one to identify the species as a member of the pea family. Since the tree is indigenous to North America, it is said that long back the native Indians used the bark of black locust to prepare cathartics and potent purgatives. However, as the black locust encloses minor toxic elements, these medications were never widely accepted by the masses.

The wood of the black locust is the most important part of the tree and is extensively used in the construction industry. Nevertheless, posts made from black locust are so firm and hardy that they are able to withstand all weather conditions for over 50 years. This particular aspect of the tree encouraged the early settlers in North America to extensively grown the tree all over the continent.

From time to time, numerous Europeans have undertaken a number of researches to ascertain the therapeutic properties of black locust. They prepared an infusion with the dried flowers of the tree to cure nausea, headaches and also stomach pains. In addition, flowers of black locust were soaked in wine and the liquid was taken internally as a medication for anemia.

Black locust grows over an extensive area in North America. While the tree is found in abundance between the stretches from Nova Scotia to Ontario in Canada, in the United States, black locust grows all over from Maine to California. The species flourishes in any type of soil having adequate drainage system. Nevertheless, the black locust does not grow well in rich or fertilized soils. The tree has the aptitude to survive even in arid and barren locations and is able to withstand drought as well as air pollution.

Black locust grows rapidly during the first 30 years of their existence and may start blossoming from the sixth year. However, the tree normally bears flowers when it is 10-12 years old. The black locust is an ideal bee plant and hence its blossoms enclose abundance of nectar and have an aroma similar to vanilla. Although the tree grows to a height of around 30 meters, its branches are awfully easily broken and liable to damage by strong winds.

The black locust is infamous as a ravenous tree that depletes all minerals from the soil making it poor as far as its fertility is concerned. The tree is, however, unaffected by honey fungus and an excellent bee plant.

Black Locust (Robinia Pseudoacacia) Health Benefits

Black Locust (Robinia Pseudoacacia) flower

The different parts of the black locust tree have different therapeutic properties and they include the aptitude to cure spasms, viral attacks, expel waste from the body, purify the system, energize the body, promote the flow of bile and even treat cancer. In addition, some of these parts are scented and function as diuretic, emollients, laxative, and purgative. Besides, some of them are narcotic in nature too.

Blossoms of black locust are scented and possess anti-spasmodic, diuretic, laxative and emollient (aptitude to soothe) properties. Many people even cook the flowers and consume them to cure eye problems. Flowers of black locust are believed to enclose an anti-tumor or tumor combating chemical called benzoaldehyde.

Blooms of black locust have a pleasant and sweet aroma and are extensively used in making jams and pancakes. Many people also cook the flowers for consumption. They may also be used to prepare an enjoyable beverage.

On the other hand, the inside bark and the root bark of the species are capable to expelling wastes from the body and are usually used as purgatives and stimulants or energizers. Many people chew the root bark of the tree to bring out vomiting and it is also retained in the mouth to alleviate toothache. However, it is interesting to note that despite such medicinal properties of the black locust bark, it is hardly prescribed by the herbal medical practitioners to treat any of the above mentioned problems. The fruits or berries, especially the seedpods, have narcotic properties and are often used as an analgesic. When ingested, the leaves of the tree are able to enhance the secretion and flow of bile as well as soothe the aggravated organs. In addition to these, the juice extracted from the leaves help to combat or restrain viruses.

The wood of black locust is very hard and durable and, hence, is usually used as fence posts, mine timbers and railway ties. Another advantage of the black locust is that its rapid growth has made it a favorite of the environmentalists who prefer to grow them to control soil erosion. In addition, the tree is also useful for yielding colorants, fiber and fuel.

The timber of black locust is compact in structure and texture, extremely tough, very durable when in contact with the ground, weighty, tremendously sturdy and also shock resistant. One cubic feet of the wood weighs as much as 45 pounds and is extensively utilized in building ships, making fence posts, wooden pegs, wooden floors and others where durability and strength are essential.

In addition, the wood of black locust is also an excellent fuel, but requires caution while using as it not only blazes, but also gives out violent sparks. In fact, the timber of the species (scientific name Robinia pseudoacacia var. rectissima) is also known as the ‘Long Island' or the ‘Ship mast' locust. This wood is comparatively more resilient to decay and wood boring pests and is more durable than any other locust timber used to make posts and stakes by approximately 50 to 100 per cent.

Black locust seeds yield oil, while the flowers produce an essential oil. The essential oil obtained from the flowers of this species is extremely appreciated and used by the cosmetic industry in making perfumes. The bark of the tree yields a yellow colorant called ‘Robinetin' that is very potent dye that is compliant with various corrosives in distinct shades muck akin to the colorants acquired with quercetin, fisetin and myricetin. Using aluminum, robinetin colors cotton materials to a brownish-orange tint. Although the bark of black locust encloses some amount of tannin, it is not adequate for commercial use.

Black Locust (Robinia Pseudoacacia) tree

Normally, when the humidity is around 10 per cent, the tannin content in the bark is around 7.2 per cent, while the hard central wood of young trees contains around 5.7 per cent of tannin at the same moisture level. Interesting, the bark of this species is also utilized in making paper and it also often serves as a replacement for silk and wool! As mentioned earlier, the black locust trees are able to develop secondary shoots from under the ground easily and rapidly (sucker) and when they form dense thickets they are useful for protecting embankments.

Seeds of the black locust are oily and consumed after cooking. Normally, the seeds are boiled to take out their bitter tang and eaten like peas. In fact, young seedpods are eaten along with the seeds. The seedpods enclose a sweet tasting pulp that is enjoyed by kids. The seeds of this species are enclosed in pods measuring around 10 cm in length and each pod encloses anything between four and eight seeds each about 4 mm long. The seeds are said to have nutritional value and the nutritional analysis of the seeds are available.

The peel of the fruits or berries is also used to prepare a potent, narcotizing and heady beverage. A substance called piperonal is obtained from the black locust plant and usually made use of as a replacement for vanilla.

Black Locust (Robinia Pseudoacacia) Side effects

Here is a word of caution; all the above mentioned substances need to be used carefully owing to their varying degree of toxic content.